\documentclass[12pt]{article}
\usepackage{pstricks-add}
\pagestyle{empty}
\begin{document}
\newrgbcolor{zzzzzz}{0.6 0.6 0.6}
\psset{xunit=0.6cm,yunit=0.6cm,algebraic=true,dotstyle=o,dotsize=7pt 0,
linewidth=1.0pt,arrowsize=3pt 2,arrowinset=0.25}
\begin{pspicture*}(4.41,0.19)(31.63,15.93)
\psplot[linecolor=zzzzzz]{26.23}{31.63}{(-210.43--12.16*x)/14.57}
\psplot[linecolor=zzzzzz]{26.23}{31.63}{(--109.47-1.5*x)/9.39}
\psline[linecolor=zzzzzz](24.48,6.73)(26.23,7.46)
\psplot[linecolor=zzzzzz]{24.48}{31.63}{(--382.3-15.15*x)/1.69}
\psplot[linecolor=zzzzzz]{4.41}{20.58}{(-104.87--2.97*x)/-5.6}
\psplot[linecolor=zzzzzz]{4.41}{20.58}{(-16.24-0.79*x)/-4.16}
\psline[linecolor=zzzzzz](20.58,7.83)(24.48,6.73)
\psplot{4.41}{31.63}{(--438.85-22.27*x)/-7.08}
\psplot[linewidth=0.4pt,linestyle=dashed,dash=3pt 3pt,linecolor=zzzzzz]{4.41}{31.63}{(--363.85-7.08*x)/22.27}
\psplot[linestyle=dashed,dash=1pt 3pt 7pt 3pt ]{4.41}{31.63}{(--4242.18-588.31*x)/-186.93}
\rput[tl](12.59,9.38){$R(p_L)$}
\psdots(21.41,9.87)
\psdots(26.79,10.47)
\rput[bl](10,12.28){$c_{L'}$}
\psdots(27.32,7.66)
\rput[bl](27.6,7.9){$p_L$}
\psdots(24.51,2.35)
\psdots(20.9,6.67)
\rput[bl](23.31,14.22){$L$}

\psdots[dotsize=7pt 0,dotstyle=*,linecolor=darkgray](11.26,12.76)
\rput[bl](7,2.79){$L'$}
\end{pspicture*}
\end{document}